How to Get Rid of Squash Bugs

Last updated: November 2026

To get rid of squash bugs, crush the bronze egg clusters on leaf undersides every few days, trap adults under boards laid between plants, and treat young nymphs while they are still small, because adults are hard to control.^1,3 Row covers until flowering and good cleanup in fall keep the next season's numbers down.³ Here is how to do each step and when.

How to recognize squash bugs

Adult squash bugs (Anasa tristis) are flat, gray-brown insects about 1.5 cm long, often mistaken for stink bugs.^1,4 They hide at the base of plants and under leaves and scatter when disturbed.³ They feed by sucking sap from leaves, stems and fruit, which leaves yellow speckles that turn brown, wilting runners and scarred fruit.^1,4 Heavy feeding can collapse young plants.^4,6

Pumpkins, winter squash and summer squash are their favorite hosts; cucumbers and melons are attacked less often.^2,3 For photos of every stage, see our squash bug profile.

Life stages and what to target

Eggs hatch in about 7 to 10 days, and nymphs pass through five stages over roughly 4 to 6 weeks.^1,2 Northern gardens usually see one generation a year; southern gardens can see two or more, so overlapping stages are common by midsummer.^3,5

Step-by-step plan

1. Cover young plants. Put floating row covers over squash at planting and seal the edges with soil.³ Remove them when female flowers open so bees can pollinate.^1,3
2. Check leaf undersides every 2 to 3 days from early summer.¹ Scrape egg clusters into soapy water or press them off with duct tape.⁵
3. Set board traps. Lay boards or shingles on the soil between plants.^1,6 Adults shelter underneath at night; lift the boards each morning and drop the bugs into soapy water.^1,6
4. Treat nymph groups early. Insecticidal soap and neem oil work best on young nymphs and must contact them directly.^4,5 Spray leaf undersides in the evening and repeat weekly.⁵ Our neem oil vs insecticidal soap guide explains the difference.
5. Use stronger options only on heavy infestations. Contact products such as pyrethrin reduce nymph numbers but have little effect on adults and can harm bees.^2,3,8 Apply late in the day and avoid open flowers.¹
6. Clean up after harvest. Remove vines, fallen fruit and boards, and avoid thick mulch next to squash beds, because adults overwinter in garden debris.^3,6

Varieties and planting choices

Some squash types are less attractive to squash bugs.^1,2 Butternut and some acorn types tend to suffer less than Hubbard squash and pumpkins, which can serve as a trap crop at the edge of the garden.^1,2,7 Planting a few weeks later than usual can also help plants miss the first wave of egg laying.³ Rotate squash beds each year, and give plants full sun and steady watering: vigorous plants tolerate some feeding far better than stressed ones.^2,3 For growing tips, see our squash crop page.

Natural enemies

A small tachinid fly (Trichopoda pennipes) lays eggs on squash bug adults and nymphs, and its larvae develop inside them.^2,3 Tiny wasps parasitize squash bug eggs.^2,3 Flowering herbs and native plants near the garden help keep these allies around, so avoid broad sprays when numbers are low.^1,2 Squash bugs are often found alongside cucumber beetles, so monitor for both.

When to act

US searches for squash bug help peak in July, but by then adults have already laid several rounds of eggs. The most effective work happens in June: row covers at planting, egg checks from the first runners, and board traps from the first adult sighting.^3,7